A circular-shaped item designed to maintain predetermined distance between assembled parts and/or for distributing pressure or preventing endwise movement between member parts. It has a solid cross-section and two flat parallel bearing surfaces. The distance between the bearing surfaces perpendicular to the axis of the centrally located hole shall not exceed 25 percent of the outside diameter. The diameter of the centrally located hole must exceed 75 percent of the outside diameter. Excludes laminated items. For items manufactured from impregnated graphite or lubricated nonmetallic materials, excluding felt or plastics, see gasket. For items manufactured from lubricated plastics, see bearing, washer, thrust. For items manufactured from lubricated felt, see felt, mechanical, preformed. Excludes disk, valve; insulator washer; and shim. See also spacer, plate and spacer, sleeve.
Dept. of the Navy 
Portugal 
Greece Classification: Copper screws, nuts, bolts, rivets, and other fasteners not threaded
NSN 5999-00-611-6807
NSN 5960-01-309-3896
NSN 5945-00-147-0617
NSN 6145-01-464-7813
NSN 6620-00-376-7046
NSN 4140-01-499-8906
NSN 5910-00-085-5818
NSN 6620-00-229-2728
NSN 6130-01-026-1949
NSN 6220-01-113-3257
NSN 5920-01-650-6510
NSN 6105-01-363-8389